Epubfix Verified -

Sometimes the book reads fine, but the metadata (title, author, cover) is broken. This is a lighter form of corruption.

For a true on mobile, upload the broken file to Google Drive, then use a web-based validator like W3C EpubCheck (mobile browser compatible). Download the corrected version. ePubFix

ePubFix automates the most frequent repairs without altering the original content’s intended layout or semantics. It works on the unpacked EPUB structure, applies targeted corrections, and repackages a clean, spec‑compliant EPUB. Sometimes the book reads fine, but the metadata

Repairs or adds missing language tags, titles, and author names required by retail platforms like Apple Books and Kobo. Sometimes the book reads fine

Ensures the file uses proper UTF-8 encoding, preventing "weird symbols" or garbled text on devices that default to older standards like ISO-8859-1.